My only complaints after a week with my new 9-3 is the clutch. It's got such a long throw it's unbelievable. I know the Viggen's is really short, but I have never driven a car with as long a clutch pedal throw as these.
They're a touch down on power from the stock Viggen, but it's far more controlled, and as Jameson said the platform is lightyears ahead of the previous 9-3. It doesn't feel like it's as quick as it actually is. It's very smooth, there's no wall of torque, so that might be why it feels different. It can grab rubber on a shift but no, it won't break the tires loose.
I don't regret getting the new car a bit, to be honest. The Viggen is cool and unique, while I bought a regular ol' 9-3 straight off the lot, so if that's an issue for you then you may want to look for a Turbo-X down the road. The long warranty was appealing, after dumping around $3k into various issues on the Viggen this year. The interior is a lot more generic than the previous generations; for example the SID is gone, it's now a display in the speedo cluster same as most any other Euro car (which is actually safer).
At the price point they're regularly at, there's a lot of cars out there that I would look at. I bought mine because of the sick amount of rebates and incentives they had going on til the end of October. I think it's a fine car. I love the looks of it, the front end is amazing and the ice block tails provide a great contrast to the jet black paint without looking cheesy/ricey. Looks are, of course, subjective; the other cars in the segment you may cross-shop (A4, 3 series) do nothing for me personally.
It's not as much of a standout as the Viggen was, but the firm chassis, improved handling, smooth engine (with a hint of turbine whistle stock, loves it) and comfortable interior was just too tempting, especially at the $23k price I got.